package pool import ( "context" "crypto/ecdsa" "errors" "fmt" "math/rand" "sync" "time" "github.com/nspcc-dev/neofs-api-go/pkg/acl/eacl" "github.com/nspcc-dev/neofs-api-go/pkg/client" "github.com/nspcc-dev/neofs-api-go/pkg/container" cid "github.com/nspcc-dev/neofs-api-go/pkg/container/id" "github.com/nspcc-dev/neofs-api-go/pkg/object" "github.com/nspcc-dev/neofs-api-go/pkg/owner" "github.com/nspcc-dev/neofs-api-go/pkg/session" "go.uber.org/zap" ) // Client is a wrapper for client.Client to generate mock. type Client interface { client.Client } // BuilderOptions contains options used to build connection pool. type BuilderOptions struct { Key *ecdsa.PrivateKey Logger *zap.Logger NodeConnectionTimeout time.Duration NodeRequestTimeout time.Duration ClientRebalanceInterval time.Duration SessionExpirationEpoch uint64 weights []float64 addresses []string clientBuilder func(opts ...client.Option) (client.Client, error) } // Builder is an interim structure used to collect node addresses/weights and // build connection pool subsequently. type Builder struct { addresses []string weights []float64 } // ContainerPollingParams contains parameters used in polling is a container created or not. type ContainerPollingParams struct { CreationTimeout time.Duration PollInterval time.Duration } // DefaultPollingParams creates ContainerPollingParams with default values. func DefaultPollingParams() *ContainerPollingParams { return &ContainerPollingParams{ CreationTimeout: 120 * time.Second, PollInterval: 5 * time.Second, } } // AddNode adds address/weight pair to node PoolBuilder list. func (pb *Builder) AddNode(address string, weight float64) *Builder { pb.addresses = append(pb.addresses, address) pb.weights = append(pb.weights, weight) return pb } // Build creates new pool based on current PoolBuilder state and options. func (pb *Builder) Build(ctx context.Context, options *BuilderOptions) (Pool, error) { if len(pb.addresses) == 0 { return nil, errors.New("no NeoFS peers configured") } options.weights = adjustWeights(pb.weights) options.addresses = pb.addresses if options.clientBuilder == nil { options.clientBuilder = client.New } return newPool(ctx, options) } // Pool is an interface providing connection artifacts on request. type Pool interface { client.Object client.Container Connection() (client.Client, *session.Token, error) OwnerID() *owner.ID WaitForContainerPresence(context.Context, *cid.ID, *ContainerPollingParams) error } type clientPack struct { client client.Client sessionToken *session.Token healthy bool } var _ Pool = (*pool)(nil) type pool struct { lock sync.RWMutex sampler *Sampler owner *owner.ID clientPacks []*clientPack } func newPool(ctx context.Context, options *BuilderOptions) (Pool, error) { clientPacks := make([]*clientPack, len(options.weights)) var atLeastOneHealthy bool for i, address := range options.addresses { c, err := options.clientBuilder(client.WithDefaultPrivateKey(options.Key), client.WithURIAddress(address, nil), client.WithDialTimeout(options.NodeConnectionTimeout)) if err != nil { return nil, err } var healthy bool st, err := c.CreateSession(ctx, options.SessionExpirationEpoch) if err != nil && options.Logger != nil { options.Logger.Warn("failed to create neofs session token for client", zap.String("address", address), zap.Error(err)) } else if err == nil { healthy, atLeastOneHealthy = true, true } clientPacks[i] = &clientPack{client: c, sessionToken: st, healthy: healthy} } if !atLeastOneHealthy { return nil, fmt.Errorf("at least one node must be healthy") } source := rand.NewSource(time.Now().UnixNano()) sampler := NewSampler(options.weights, source) wallet, err := owner.NEO3WalletFromPublicKey(&options.Key.PublicKey) if err != nil { return nil, err } ownerID := owner.NewIDFromNeo3Wallet(wallet) pool := &pool{sampler: sampler, owner: ownerID, clientPacks: clientPacks} go startRebalance(ctx, pool, options) return pool, nil } func startRebalance(ctx context.Context, p *pool, options *BuilderOptions) { ticker := time.NewTimer(options.ClientRebalanceInterval) buffer := make([]float64, len(options.weights)) for { select { case <-ctx.Done(): return case <-ticker.C: updateNodesHealth(ctx, p, options, buffer) ticker.Reset(options.ClientRebalanceInterval) } } } func updateNodesHealth(ctx context.Context, p *pool, options *BuilderOptions, bufferWeights []float64) { if len(bufferWeights) != len(p.clientPacks) { bufferWeights = make([]float64, len(p.clientPacks)) } healthyChanged := false wg := sync.WaitGroup{} for i, cPack := range p.clientPacks { wg.Add(1) go func(i int, client client.Client) { defer wg.Done() var ( tkn *session.Token err error ) ok := true tctx, c := context.WithTimeout(ctx, options.NodeRequestTimeout) defer c() if _, err = client.EndpointInfo(tctx); err != nil { ok = false bufferWeights[i] = 0 } if ok { bufferWeights[i] = options.weights[i] p.lock.RLock() if !p.clientPacks[i].healthy { if tkn, err = client.CreateSession(ctx, options.SessionExpirationEpoch); err != nil { ok = false bufferWeights[i] = 0 } } p.lock.RUnlock() } p.lock.Lock() if p.clientPacks[i].healthy != ok { p.clientPacks[i].healthy = ok p.clientPacks[i].sessionToken = tkn healthyChanged = true } p.lock.Unlock() }(i, cPack.client) } wg.Wait() if healthyChanged { probabilities := adjustWeights(bufferWeights) source := rand.NewSource(time.Now().UnixNano()) p.lock.Lock() p.sampler = NewSampler(probabilities, source) p.lock.Unlock() } } func adjustWeights(weights []float64) []float64 { adjusted := make([]float64, len(weights)) sum := 0.0 for _, weight := range weights { sum += weight } if sum > 0 { for i, weight := range weights { adjusted[i] = weight / sum } } return adjusted } func (p *pool) Connection() (client.Client, *session.Token, error) { p.lock.RLock() defer p.lock.RUnlock() if len(p.clientPacks) == 1 { cp := p.clientPacks[0] if cp.healthy { return cp.client, cp.sessionToken, nil } return nil, nil, errors.New("no healthy client") } attempts := 3 * len(p.clientPacks) for k := 0; k < attempts; k++ { i := p.sampler.Next() if cp := p.clientPacks[i]; cp.healthy { return cp.client, cp.sessionToken, nil } } return nil, nil, errors.New("no healthy client") } func (p *pool) OwnerID() *owner.ID { return p.owner } func (p *pool) conn(option []client.CallOption) (client.Client, []client.CallOption, error) { conn, token, err := p.Connection() if err != nil { return nil, nil, err } return conn, append([]client.CallOption{client.WithSession(token)}, option...), nil } func (p *pool) PutObject(ctx context.Context, params *client.PutObjectParams, option ...client.CallOption) (*object.ID, error) { conn, options, err := p.conn(option) if err != nil { return nil, err } return conn.PutObject(ctx, params, options...) } func (p *pool) DeleteObject(ctx context.Context, params *client.DeleteObjectParams, option ...client.CallOption) error { conn, options, err := p.conn(option) if err != nil { return err } return conn.DeleteObject(ctx, params, options...) } func (p *pool) GetObject(ctx context.Context, params *client.GetObjectParams, option ...client.CallOption) (*object.Object, error) { conn, options, err := p.conn(option) if err != nil { return nil, err } return conn.GetObject(ctx, params, options...) } func (p *pool) GetObjectHeader(ctx context.Context, params *client.ObjectHeaderParams, option ...client.CallOption) (*object.Object, error) { conn, options, err := p.conn(option) if err != nil { return nil, err } return conn.GetObjectHeader(ctx, params, options...) } func (p *pool) ObjectPayloadRangeData(ctx context.Context, params *client.RangeDataParams, option ...client.CallOption) ([]byte, error) { conn, options, err := p.conn(option) if err != nil { return nil, err } return conn.ObjectPayloadRangeData(ctx, params, options...) } func (p *pool) ObjectPayloadRangeSHA256(ctx context.Context, params *client.RangeChecksumParams, option ...client.CallOption) ([][32]byte, error) { conn, options, err := p.conn(option) if err != nil { return nil, err } return conn.ObjectPayloadRangeSHA256(ctx, params, options...) } func (p *pool) ObjectPayloadRangeTZ(ctx context.Context, params *client.RangeChecksumParams, option ...client.CallOption) ([][64]byte, error) { conn, options, err := p.conn(option) if err != nil { return nil, err } return conn.ObjectPayloadRangeTZ(ctx, params, options...) } func (p *pool) SearchObject(ctx context.Context, params *client.SearchObjectParams, option ...client.CallOption) ([]*object.ID, error) { conn, options, err := p.conn(option) if err != nil { return nil, err } return conn.SearchObject(ctx, params, options...) } func (p *pool) PutContainer(ctx context.Context, cnr *container.Container, option ...client.CallOption) (*cid.ID, error) { conn, options, err := p.conn(option) if err != nil { return nil, err } return conn.PutContainer(ctx, cnr, options...) } func (p *pool) GetContainer(ctx context.Context, cid *cid.ID, option ...client.CallOption) (*container.Container, error) { conn, options, err := p.conn(option) if err != nil { return nil, err } return conn.GetContainer(ctx, cid, options...) } func (p *pool) ListContainers(ctx context.Context, ownerID *owner.ID, option ...client.CallOption) ([]*cid.ID, error) { conn, options, err := p.conn(option) if err != nil { return nil, err } return conn.ListContainers(ctx, ownerID, options...) } func (p *pool) DeleteContainer(ctx context.Context, cid *cid.ID, option ...client.CallOption) error { conn, options, err := p.conn(option) if err != nil { return err } return conn.DeleteContainer(ctx, cid, options...) } func (p *pool) GetEACL(ctx context.Context, cid *cid.ID, option ...client.CallOption) (*client.EACLWithSignature, error) { conn, options, err := p.conn(option) if err != nil { return nil, err } return conn.GetEACL(ctx, cid, options...) } func (p *pool) SetEACL(ctx context.Context, table *eacl.Table, option ...client.CallOption) error { conn, options, err := p.conn(option) if err != nil { return err } return conn.SetEACL(ctx, table, options...) } func (p *pool) AnnounceContainerUsedSpace(ctx context.Context, announce []container.UsedSpaceAnnouncement, option ...client.CallOption) error { conn, options, err := p.conn(option) if err != nil { return err } return conn.AnnounceContainerUsedSpace(ctx, announce, options...) } func (p *pool) WaitForContainerPresence(ctx context.Context, cid *cid.ID, pollParams *ContainerPollingParams) error { conn, _, err := p.Connection() if err != nil { return err } wctx, cancel := context.WithTimeout(ctx, pollParams.CreationTimeout) defer cancel() ticker := time.NewTimer(pollParams.PollInterval) defer ticker.Stop() wdone := wctx.Done() done := ctx.Done() for { select { case <-done: return ctx.Err() case <-wdone: return wctx.Err() case <-ticker.C: _, err = conn.GetContainer(ctx, cid) if err == nil { return nil } ticker.Reset(pollParams.PollInterval) } } }